Now lets monkey with this tag a bit. For my model I have a belongs_to association called “group leader” that I want to filter, or put another way I want to restrict the entries that can appear in my dropdown.

Explained simply:
- extend alters the tag auto-generated by rapid
- old-form merge; see the agility tutorial more on this construct
- group-leader-view ; we can change the markup generated for any field in field list

This works like a charm!

How to learn more? Probably the best thing you can do is work through the DRYML guide; this will help you crack the mystery of these tags and empower to alter the functionality of the Rapid tags, as well as write your own. Good luck!